概率计算思维抽象,方法独特,要用到较复杂的排列、组合知识,难度较大,稍有疏忽就会致错,本文就概率题的常见错解归类予以剖析.希望引起同学们的注意. 1.求等可能性事件的概率时,忽视事件的有限、等可能性致误. 新教材第二册“10.5等可能性事件的概率”介绍了一种特殊的概率模型——古典概型,其特点有二,①只含有限个基本事件,②每个基本事件是等 Probability calculations are abstract in thinking, unique in method, and require more complicated arrangement and combination of knowledge. It is more difficult to make mistakes. If you neglect it, you will be mistaken. This article analyzes the common misunderstandings of probability questions and hopes to attract the attention of the students. 1. When seeking the probability of such likelihood events, ignore the possibility of limited events and other possibilities. The second book “Probability of 10.5 possible events” introduces a special probability model—classical outlines. There are two characteristics, one contains a limited number of basic events, 2 each basic event is